Back to Search Start Over

NADP + is an endogenous PARP inhibitor in DNA damage response and tumor suppression.

Authors :
Bian C
Zhang C
Luo T
Vyas A
Chen SH
Liu C
Kassab MA
Yang Y
Kong M
Yu X
Source :
Nature communications [Nat Commun] 2019 Feb 11; Vol. 10 (1), pp. 693. Date of Electronic Publication: 2019 Feb 11.
Publication Year :
2019

Abstract

ADP-ribosylation is a unique posttranslational modification catalyzed by poly(ADP-ribose) polymerases (PARPs) using NAD <superscript>+</superscript> as ADP-ribose donor. PARPs play an indispensable role in DNA damage repair and small molecule PARP inhibitors have emerged as potent anticancer drugs. However, to date, PARP inhibitor treatment has been restricted to patients with BRCA1/2 mutation-associated breast and ovarian cancer. One of the major challenges to extend the therapeutic potential of PARP inhibitors to other cancer types is the absence of predictive biomarkers. Here, we show that ovarian cancer cells with higher level of NADP <superscript>+</superscript> , an NAD <superscript>+</superscript> derivative, are more sensitive to PARP inhibitors. We demonstrate that NADP <superscript>+</superscript> acts as a negative regulator and suppresses ADP-ribosylation both in vitro and in vivo. NADP <superscript>+</superscript> impairs ADP-ribosylation-dependent DNA damage repair and sensitizes tumor cell to chemically synthesized PARP inhibitors. Taken together, our study identifies NADP <superscript>+</superscript> as an endogenous PARP inhibitor that may have implications in cancer treatment.

Details

Language :
English
ISSN :
2041-1723
Volume :
10
Issue :
1
Database :
MEDLINE
Journal :
Nature communications
Publication Type :
Academic Journal
Accession number :
30741937
Full Text :
https://doi.org/10.1038/s41467-019-08530-5